disc brake kits ( maine)

As you guys can tell were kind of new to this myself and my 14 year old are doing this together for his car, i looked at the scarebird web page kind of vag on details then we went to willwood.com prices were alot cheaper then year one, have any of you used these? will putting disc brakes on the front make my choices for rims hard after we install these , thanks for all the help so far